First cousin marriages and X-heterosis in women.
D000022:Abortion, Spontaneous / Q000235:genetics; D003241:Consanguinity; D005260:Female; D005298:Fertility; D005313:Fetal Death; D006801:Humans; D008297:Male; D010154:Pakistan; D011247:Pregnancy; D012730:Sex Chromosomes; D012744:Sex Ratio; D014960:X Chromosome